9+2n-1=90

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Solution for 9+2n-1=90 equation: 



9+2n-1=90

We move all terms to the left:

9+2n-1-(90)=0

We add all the numbers together, and all the variables

2n-82=0

We move all terms containing n to the left, all other terms to the right

2n=82

n=82/2

n=41

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